So, if we focus in the node where introspection run properly (c6f8f4ba-
9c7c-4c87-b95a-67a5861b7bec), we can see following info:


1. Introspection finishes successfully with right information according to 
inspector logs:

2016-12-21 06:41:24.030 24006 INFO ironic_inspector.plugins.standard [-] [node: 
c6f8f4ba-9c7c-4c87-b95a-67a5861b7bec state processing MAC 00:fc:e0:2e:a1:ec] 
Discovered data: CPUs: 2 x86_64, memory 8192 MiB, disk 49 GiB
2016-12-21 06:41:26.408 24006 INFO ironic_inspector.process [-] [node: 
c6f8f4ba-9c7c-4c87-b95a-67a5861b7bec state None MAC 00:fc:e0:2e:a1:ec] 
Introspection finished successfully

2. Nova scheduler discards it by RamFilter:

2016-12-21 06:45:57.537 17759 DEBUG nova.filters 
[req-a2319864-8629-4b7f-8b94-d41911ad02d0 4f103e0230074c2488b7359bc079d323 
f21dbfb3b2c840059ec2a0bba03b7385 - - -] Filter AvailabilityZoneFilter returned 
1 host(s) get_filtered_objects 
/usr/lib/python2.7/site-packages/nova/filters.py:104
2016-12-21 06:45:57.538 17759 DEBUG nova.scheduler.filters.ram_filter 
[req-a2319864-8629-4b7f-8b94-d41911ad02d0 4f103e0230074c2488b7359bc079d323 
f21dbfb3b2c840059ec2a0bba03b7385 - - -] (undercloud, 
c6f8f4ba-9c7c-4c87-b95a-67a5861b7bec) ram: 0MB disk: 0MB io_ops: 0 instances: 0 
does not have 8192 MB usable ram before overcommit, it only has 0 MB. 
host_passes 
/usr/lib/python2.7/site-packages/nova/scheduler/filters/ram_filter.py:45

That's about 4 minutes and 30 seconds between end of introspection and
nova scheduller error, I'd say that should be enough, what do you think?

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https://bugs.launchpad.net/bugs/1651704

Title:
  Overcloud deployment fails when node introspection is enabled

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